Stator, motor, compressor, and refrigeration air conditioner

Abstract

A stator includes a first core including a plurality of non-oriented electromagnetic steel sheets stacked in layers and having an insertion hole penetrating the plurality of non-oriented electromagnetic steel sheets in an axial direction of the stator and a second core arranged in the insertion hole and including a plurality of oriented electromagnetic steel sheets stacked in layers. The first core has a side wall part adjoining a side surface of the second core extending in the axial direction of the stator, and the side wall part has an opening part that exposes the side surface of the second core.

The invention claimed is: 
     
       1. A stator comprising:
 a first core including a plurality of non-oriented electromagnetic steel sheets stacked in layers and having an insertion hole penetrating the plurality of non-oriented electromagnetic steel sheets in an axial direction of the stator; and 
 a second core arranged in the insertion hole and including a plurality of oriented electromagnetic steel sheets stacked in layers, wherein 
 the first core has a side wall part adjoining a side surface of the second core extending in the axial direction of the stator, and 
 the side wall part has an opening part that exposes the side surface of the second core. 
 
     
     
       2. The stator according to  claim 1 , wherein the opening part has a first opening region and a second opening region arranged to be separate from the first opening region. 
     
     
       3. The stator according to  claim 1 , wherein
 the first core has a tooth part, 
 the insertion hole has a first insertion hole formed in the tooth part, and 
 the second core has a first oriented core provided in the first insertion hole of the tooth part, an easy magnetization direction of the oriented electromagnetic steel sheets of the first oriented core being parallel to a radial direction of the stator passing through the first insertion hole. 
 
     
     
       4. The stator according to  claim 3 , wherein a fitting part for fitting the first core and the second core together is provided in a boundary part between the first insertion hole and the second core in regard to the radial direction. 
     
     
       5. The stator according to  claim 4 , wherein
 the first core has a yoke part having a yoke central part and yoke end parts situated on both sides of the yoke central part in a circumferential direction, 
 the insertion hole has a second insertion hole formed in the yoke end part, 
 the second core has a second oriented core provided in the second insertion hole, and 
 an easy magnetization direction of the oriented electromagnetic steel sheets of the second oriented core is parallel to a direction that is orthogonal to the radial direction of the stator passing through the first insertion hole. 
 
     
     
       6. The stator according to  claim 5 , wherein
 the insertion hole further has a third insertion hole formed in the yoke central part, 
 the second core further has a third oriented core provided in the third insertion hole of the yoke central part, and 
 an easy magnetization direction of the oriented electromagnetic steel sheets of the third oriented core is a direction parallel to a direction of a straight line connecting a center of the first insertion hole and a center of the second insertion hole. 
 
     
     
       7. The stator according to  claim 3 , further comprising:
 an insulator covering the tooth part of the first core; and 
 a winding wound around the tooth part via the insulator. 
 
     
     
       8. A motor comprising:
 the stator according to  claim 1 ; 
 a rotor; and 
 a support part to which the stator is fixed and which supports the rotor to be rotatable. 
 
     
     
       9. A compressor comprising the motor according to  claim 8 . 
     
     
       10. A refrigeration air conditioner comprising the compressor according to  claim 9 .